Migrate to Vitest 4#1221
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Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.9 to 4.1.0. - [Release notes](https://github.com/vitest-dev/vitest/releases) - [Changelog](https://github.com/vitest-dev/vitest/blob/main/docs/releases.md) - [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.0/packages/vitest) --- updated-dependencies: - dependency-name: vitest dependency-version: 4.1.0 dependency-type: direct:development ... Signed-off-by: dependabot[bot] <support@github.com>
Vitest 4 updates Chai and mock typing enough that the old test setup no longer type-checks. Drop the local ChaiUtils.eql augmentation now that Chai owns that type, align package-local @vitest/expect versions with the root runner, and add explicit Node test types where the workspace uses Node globals. Move the fork worker options to the Vitest 4 top-level config shape and make the language server test mocks explicit so TypeScript does not infer private @vitest/spy types.
karreiro
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Jun 2, 2026
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Thank you, @graygilmore!
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Summary
Bumps Vitest from
2.1.9to4.1.0and applies the migration cleanup needed for CI:@vitest/expectversions with the root Vitest runnerChaiUtils.eqltype augmentation now that Chai owns that typeContext
This supersedes #1219. The Dependabot bump alone fails during the build because the older test setup no longer type-checks against the Vitest 4/Chai types.
This keeps the dependency upgrade but makes it an explicit migration PR instead of carrying source changes on the Dependabot branch.